5,

a,

`-2 le x le -0,5` és `1 le x le 5/2`

`x in RR| x in {[-2;-0.5] cup [1;5/2]}`

b,

`-7/3 le x le -5/4` és `-1/2 lt x lt 1/3`

`x in RR| x in {[-7/3;-5/4] cup ]-1/2;1/3[}`

c,

`-oo lt x lt -3` és `-1 lt x lt oo`

`x in RR| x in {]oo;-3[ cup ]-1;oo[}`

d,

`-1 le x le 4`, `x ne 0, 1, 2, 3,`

`x in RR| x in [-1;4]"\"{0;1;2;3}`


a,

`-2.3 le x le 1.2`

`x in RR|x in [-2.3;1.2]`

b,

`-4 le x le 0; x ne -2`

`{x in RR| x in [-4;0]"\"2}`

c,

`-3 le x lt -1` és `1 lt x le 3`

`x in RR|x in {[-3;-1] cup ]1;3]}`